222121221212 has 144 divisors (see below), whose sum is σ = 441687254400. Its totient is φ = 97633536000.

The previous prime is 222121221197. The next prime is 222121221239. The reversal of 222121221212 is 212122121222.

It is a nude number because it is divisible by every one of its digits.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 436387214 + ... + 436387722.

It is an arithmetic number, because the mean of its divisors is an integer number (3067272600).

Almost surely, 2^222121221212 is an apocalyptic number.

222121221212 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

222121221212 is a deficient number, since it is larger than the sum of its proper divisors (219566033188).

222121221212 is a wasteful number, since it uses less digits than its factorization.

222121221212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 828 (or 815 counting only the distinct ones).

The product of its digits is 256, while the sum is 20.

Adding to 222121221212 its reverse (212122121222), we get a palindrome (434243342434).

It can be divided in two parts, 22 and 2121221212, that multiplied together give a palindrome (46666866664).

The spelling of 222121221212 in words is "two hundred twenty-two billion, one hundred twenty-one million, two hundred twenty-one thousand, two hundred twelve".